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AP1184K518L-U Datasheet(PDF) 7 Page - Diodes Incorporated |
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AP1184K518L-U Datasheet(HTML) 7 Page - Diodes Incorporated |
7 / 12 page AP1184 4A ULTRA LOW DROPOUT POSITIVE ADJUSTABLE OR FIXED-MODE REGULATOR AP1184 Rev. 4 7 of 12 MARCH 2008 www.diodes.com © Diodes Incorporated Functional Descriptions ( Continued ) Assuming, the following conditions: Vout = 2.5V Vin = 3.3V Vctrl = 5V Iout = 2A DC Avg. Calculate the maximum power dissipation using the following equation: Pd = Iout * ( Vin - Vout) + ( Iout /60) * ( Vctrl - Vout ) Pd = 2 * (3.3-2.5) + (2/60) * (5-2.5) = 1.68W Using table below select the proper package and the amount of copper board needed. Package Copper Area θ JA ( oC/W) Max Pd (TA = 25 oC) Max Pd (TA = 45 oC) TO263-5L Pad Size-1.4”X1.4” 25-45 2.4W-4.4W 2.0W-3.6W Notes: 6. Above table is based on the maximum junction temperature of 135 oC. As shown in the above table, any of the two packages will do the job. |
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